| 摘要 |
A process for the preparation of polyurethane substances in any desired form by reaction of a) polyisocyanates with b) compounds comprising at least two hydrogen atoms that are reactive toward s isocyanates, in the presence of c) catalysts known per se and d) specific stabiliser systems, wherein there is used as component d) a stabiliser system comprising at leas t two compounds of at least two structurally different stabiliser types of formula e (1), (2), (3) and (4), in which formula (1) represents formulae (1a), (1b), (1c), (1d) or (1e) (See formula I, II, III, IV, V) and the other formulae (2), (3) and (4) are as follows: (See formula VI, VII), Ar-NH-AR', wherein R1 each independently of the other is C1-C4alkyl, R2 and R5 each independent ly of the other are C1-C18alkyl, C5-C7cycloalkyl, benzyl, phenyl or a group of the formula -CH2COO-C6-C18alkyl, R3 is -H or -CH3, and R4 is C1-C12alkyl, R6 and R8 each independently of the other are C1-C18alkyl or C5-C7cycloalkyl, R7 each independently of the other is -H, C1-C4alkyl or C5-C7cycloalkyl, n is the number 1, 2 or 3, R 9 is C6-C18alkyl and R10 is methyl or ethyl, and Ar and Ar' each independently of the other a re a radical of the formula (See formula VIII, IX, X), or Ar-NH-Ar' is a radical of the formula (See formula XI), wherein R17 and R17' each independently of the other are -H or C4-C18alkyl, R11 and R12 each independently of the other are C1-C4alkyl, R13 and R14 each independently of the other are C4-C18alkyl, and R15 and R16 each independently of the other are -H or C1- C12alkyl.
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